Neco square taper bottom bracket. English thread.
I had the exact same BB on my fixie originally but converted my bike into a winter bike so I had to buy a new one since the used one was rusted and pretty well worn out. To make a long story short, the Neco BB does the job and I was satisfied after riding one full year with it.
Shipped fast, no BS. Perfect fit with no dmg upon arrival. Aventon always brings the strong game.
So far so good!
I use this BB on my steel retro-spec beater, it works perfectly fine and I also have one but a different spindle size on my Puegot road bike. This BB in general is a great one to buy if you need to replace an old one, quick, easy to install, and spin smooth. The spindle hasn't frayed on me either and I've switched crank arms multiple times as well. It's an all around great bottom bracket. Downside is ......well it is a bit heavy.